Self-start of passively mode-locked ring fibre oscillator as a function of pump power

S. Kobtsev; S. Smirnov; S. Khripunov; D. Radnatarov; S. Kukarin; A. Ivanenko

doi:10.1117/12.2052619

1 May 2014 Self-start of passively mode-locked ring fibre oscillator as a function of pump power

S. Kobtsev, S. Smirnov, S. Khripunov, D. Radnatarov, S. Kukarin, A. Ivanenko

Proceedings Volume 9135, Laser Sources and Applications II; 913522 (2014) https://doi.org/10.1117/12.2052619
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

This work presents for the first time the results of study of one of the simplest and most reliable configurations of a ring fibre laser passively mode-locked due to nonlinear polarisation evolution. The laser arrangement under consideration comprises a single phase retarding element in contrast to most widely used configurations with several wave plates or two polarisation controllers. By means of numerical simulation based on coupled non-linear Schrödinger equations for orthogonal polarisation components, we investigate mode-lock domain in terms of pump power and phase delay introduced by the single polarisation control element. Changing pump power, we demonstrate the capacity of such a simple cavity layout with only one polarisation element to operate in different lasing regimes including generation of conventional laser pulse trains at the fundamental repetition rate, generation of double-scale partially coherent and noiselike pulses and generation of multiple pulses per round-trip. Besides the results of a detailed numerical study, we also announce experimental results obtained from an Er fibre laser with a single polarisation controlling element based on an electronically driven liquid crystal. Our experimental observations are in good qualitative agreement with simulation results and constitute a platform for creation of new simple, low-cost, and reliable self-starting fibre lasers with ultrashort optical pulses.

Citation Download Citation

S. Kobtsev, S. Smirnov, S. Khripunov, D. Radnatarov, S. Kukarin, and A. Ivanenko "Self-start of passively mode-locked ring fibre oscillator as a function of pump power", Proc. SPIE 9135, Laser Sources and Applications II, 913522 (1 May 2014); https://doi.org/10.1117/12.2052619

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